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Protein unfolding--an important process in vivo?
1Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, 2205 Tech Drive, Evanston, IL 60208-3500, USA. matouschek@northwestern.edu
Current Opinion in Structural Biology
|February 13, 2003
Summary
Protein unfolding is crucial for cellular processes like degradation and translocation. Its resistance depends on local structure encountered by unfoldases, not overall protein stability, determining cellular process specificity.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Protein unfolding is essential for cellular functions such as protein degradation and translocation across membranes.
- Unfolding is often catalyzed by unfoldases that manipulate protein chains.
- Cellular processes rely on protein unfolding for specificity.
Purpose of the Study:
- To investigate the factors determining protein resistance to unfolding during cellular processes.
- To understand how local protein structure influences unfolding susceptibility.
- To elucidate the role of unfolding resistance in cellular process specificity.
Main Methods:
- Analysis of protein unfolding pathways.
- In vitro denaturation assays (temperature and solvent).
- Investigation of unfoldase-substrate interactions.
Main Results:
- Protein resistance to unfolding is not correlated with global stability (e.g., from denaturation assays).
- Resistance is determined by the local protein structure encountered first by the unfoldase.
- The unfolding pathway is altered by unfoldases pulling on polypeptide chains.
Conclusions:
- Local protein structure dictates unfolding susceptibility, not overall stability.
- This local structural feature is key to the specificity of protein degradation and translocation.
- Understanding unfolding resistance is vital for comprehending these fundamental cellular mechanisms.